<template>
  <div class="bottom-menu">
    <check-button class="select-all" :isChecked="isSelectAll"
                  @click.native="checkClick"></check-button>
    <span>全选</span>
    <span class="total-price">合计：{{totalPrice}}</span>
    <span class="buy-product" @click="calcClick">去计算({{checkLength}})</span>
  </div>
</template>

<script>
import CheckButton from './CheckButton.vue'
import {mapGetters} from 'vuex'
  export default {
    name: 'CartBottomBar',
    components: {
      CheckButton
    },
    computed: {
      ...mapGetters(['cartList']),
      totalPrice(){
        return '￥' + this.cartList.filter(item => {
          return item.checked
        }).reduce((preValue,item)=>{
          return preValue + item.price * item.counter
        },0).toFixed(2)
      },
      checkLength(){
        return this.cartList.filter(item => {
          return item.checked
        }).length
      },
      isSelectAll(){
        if(this.checkLength !== 0){
          // return !(this.cartList.filter(item => !item.checked).length)
          // return this.cartList.every(item => item.checked)
          return !this.cartList.find(item => !item.checked)
        }
      }
    },
    methods: {
      checkClick(){
        if(this.isSelectAll){
          this.cartList.forEach(item=>item.checked = false)
        }else{
          this.cartList.forEach(item=>item.checked = true)
        }
      },
      calcClick(){
        if(!this.isSelectAll){
          this.$toast.show('请选择购买的商品',2000);
        }
      }
    }
  }
</script>

<style scoped>
  .bottom-menu {
    width: 100%;
    height: 44px;
    background-color: #eee;
    position: fixed;
    bottom: 50px;
    left: 0;
    box-shadow: 0 -2px 3px rgba(0, 0, 0, .2);
    font-size: 14px;
    color: #888;
    line-height: 44px;
    padding-left: 35px;
    box-sizing: border-box;
  }

  .bottom-menu .select-all {
    position: absolute;
    line-height: 0;
    left: 12px;
    top: 13px;
  }

  .bottom-menu .total-price {
    margin-left: 15px;
    font-size: 16px;
    color: #666;
  }

  .bottom-menu .buy-product {
    background-color: #ff8198;
    color: #fff;
    width: 100px;
    height: 44px;
    text-align: center;
    line-height: 44px;
    float: right;
  }
</style>